๐”– Bobbio Scriptorium
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Ultraviolet irradiation of plastics. I. Degradation of physical properties

โœ Scribed by Stephenson, C. V. ;Moses, B. C. ;Wilcox, W. S.

Book ID
104531976
Publisher
John Wiley and Sons
Year
1961
Weight
574 KB
Volume
55
Category
Article
ISSN
0022-3832

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โœฆ Synopsis

Abstract

Polyethylene, Teflon, nylon, Mylar, and Acrilan have been irradiated in vacuo and in an atmosphere of nitrogen with narrow bands of ultraviolet radiation centered at 244, 314, and 369 ฮผ and with monochromatic ultraviolet light of wavelength 253.7 ฮผ. The physical properties of all these polymers are ultimately degraded by ultraviolet light of any of these wavelengths, but the shorter wavelengths are much the more effective in producing changes. The degradation of polyethylene, nylon, Mylar, and Acrilan is faster when irradiation is in an inert atmosphere of nitrogen than it is when irradiation is in vacuo. Teflon, however, degrades more rapidly in vacuo than in a nitrogen atmosphere.

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## Abstract Volatile decomposition products of ultravioletโ€irradiated polyethylene, nylon, Mylar, and Acrilan have been analyzed. The principal decomposition products of polyethylene are hydrogen and methane. Besides hydrogen and methane, carbon monoxide occurs in considerable amounts in the decomp